I recently bought a pair of Nike Free+.  I like them a lot.  What a difference from my usual neutral shoes!  I was wearing them for short, trail runs(under 6 mi) with socks.   I have now worn them for several 5 milers w/o socks.  Today I noticed the start of a small blister on the outer edge of my big toe(both feet) near the top of my nail.  Wondering if I should go back to wearing socks.  Or will my feet adjust to not wearing socks? I hate having to apply band aids.